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load_image.go
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load_image.go
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/*
Copyright 2016 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package nodetasks
import (
"fmt"
"os/exec"
"path"
"strings"
"github.com/golang/glog"
"k8s.io/kops/pkg/backoff"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kops/upup/pkg/fi/nodeup/cloudinit"
"k8s.io/kops/upup/pkg/fi/nodeup/local"
"k8s.io/kops/upup/pkg/fi/utils"
"k8s.io/kops/util/pkg/hashing"
)
const dockerService = "docker.service"
// LoadImageTask is responsible for downloading a docker image
type LoadImageTask struct {
Source string
Hash string
}
var _ fi.Task = &LoadImageTask{}
var _ fi.HasDependencies = &LoadImageTask{}
func (t *LoadImageTask) GetDependencies(tasks map[string]fi.Task) []fi.Task {
// LoadImageTask depends on the docker service to ensure we
// sideload images after docker is completely updated and
// configured.
var deps []fi.Task
for _, v := range tasks {
if svc, ok := v.(*Service); ok && svc.Name == dockerService {
deps = append(deps, v)
}
}
return deps
}
func (t *LoadImageTask) String() string {
return fmt.Sprintf("LoadImageTask: %s", t.Source)
}
func (e *LoadImageTask) Find(c *fi.Context) (*LoadImageTask, error) {
glog.Warningf("LoadImageTask checking if image present not yet implemented")
return nil, nil
}
func (e *LoadImageTask) Run(c *fi.Context) error {
return fi.DefaultDeltaRunMethod(e, c)
}
func (_ *LoadImageTask) CheckChanges(a, e, changes *LoadImageTask) error {
return nil
}
func (_ *LoadImageTask) RenderLocal(t *local.LocalTarget, a, e, changes *LoadImageTask) error {
hash, err := hashing.FromString(e.Hash)
if err != nil {
return err
}
url := e.Source
localFile := path.Join(t.CacheDir, hash.String()+"_"+utils.SanitizeString(url))
_, err = fi.DownloadURL(url, localFile, hash)
if err != nil {
// Hack to try to avoid failed downloads causing massive bandwidth bills
backoff.DoGlobalBackoff(fmt.Errorf("failed to download image %s: %v", url, err))
return err
}
// Load the image into docker
args := []string{"docker", "load", "-i", localFile}
human := strings.Join(args, " ")
glog.Infof("running command %s", human)
cmd := exec.Command(args[0], args[1:]...)
output, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("error loading docker image with '%s': %v: %s", human, err, string(output))
}
return nil
}
func (_ *LoadImageTask) RenderCloudInit(t *cloudinit.CloudInitTarget, a, e, changes *LoadImageTask) error {
return fmt.Errorf("LoadImageTask::RenderCloudInit not implemented")
}